Despite the presence of gray and blue inclusions and now pinkish dust or debris, the rock in question remains essentially white-ish, and apparently has plenty of white-ish material within it in addition to the other colors we see.

The notion that the pink is due to hematite dust is delightful -- would it then be from the matrix rock or from the spherules? Or both? Or neither? In other words, might the pinkish dust have been on the RAT from previous use? Robert's close up color images of the grind area do not show a significant pink component.

Of some interest is the texture of the region immediately outside the grinding sample. Doesn't it look as if the material is soft and has been shoved into place -- or... even flowed? The ring appears as a distinct mounded rim, and even if it is composed of dust from the grinding itself, the fact that it is apparently cohesive enough to stick together into such an evocative formation is interesting. What non-carbonate material would do this? It reminds me somewhat of chalk or talc.

The absence of layering in the ground out area is interesting as well. Of course it could be that the RAT has penetrated layers perpendicularly, and we would not see any from this point of view. But note that in the lower portion of the rock, parallel layering is distinct. Are we seeing two samples of layered rock at 90 degree angles to one another?

Actually, in long shots and close up, it looks like the matrix material is more like a wad of Playdoh, all mushed up (I'm sure there's some scientific term for that! ;-))

Could the voids be channels of some sort?

Cheers, BRFelix